been reporting these brothers came from a russian region near chechnya, but the older brother, dead, tamerlan tsarnaev, has been living in america since 2007. tell me your thoughts on what happened here. he's living in america since '07 and at some point, turns and decides he wants to kill americans. what would be your take in terms of the psychology and what these two are thinking or were thinking? >> well, we don't know, but we're about to find out. some say there might be a hybrid here, like major nidal hasan was radicalized via the internet, yet there was another soldier at ft. hood, an enlisted man, who built two explosive devices just like the ones we see used in boston because he had access to the same internet magazines that these guys did, but at ft. hood, he used it to kill soldiers for his own personal reasons, not necessarily anything that had to do with religion or politics. in this particular case, because perhaps the older brother was radicalized, had influence on the younger brother, who's the fugitive right now, we may find this is something like a timothy mcveigh. in essence